package main

import . "fmt"
import . "sort"
import . "strings"

func main() {
	var n int
	Scan(&n)
	s := make([]string,n)
	for i:=range s {
		var a,b string
		Scan(&a,&b)
		s[i]=a+" "+b
	}
	Strings(s)
	Println(Join(s,"\n"))
}